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人类社会发展至今的两种基本经济形态是( )。
A.自然经济和商品经济
B.商品经济和计划经济
C.简单商品经济和发达商品经济
D.资本主义市场经济和社会主义市场经济
A.自然经济和商品经济
B.商品经济和计划经济
C.简单商品经济和发达商品经济
D.资本主义市场经济和社会主义市场经济
Supposeis wage and
is a gender dummy variable,taking value 1 if an employee is female and value 0 if an employee is male. Which of the following is NOT correct, regarding the interpretation of the conditional expectation
?
A、can be interpreted as the average wage of a female worker
B、can be interpreted as the average wage of a male worker
C、
D、
Letbe the regression disturbance defined in Chapter 2. If
, with
being some constant, we say that there exists conditional homoskedasticity for
.
The OLS estimatordoes NOT exist if
A、is singular
B、
C、for some
D、All of the above
A、Assumption 3.2 implies
B、Assumption 3.2 implies, for t = 1, 2, · · · , n.
C、Assumptions 3.1 and 3.2 ensure correct model specification onfor a linear regression model.
D、Assumptions 3.1 and 3.2 can NOT guarantee correct model specification onfor a linear regression model.
A、
B、
C、
D、
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